German BEI sensors encoder, BEI sensors model, BEI sensors price

BEI sensors encoders are devices used to measure rotational speed and, in conjunction with PWM technology, enable rapid speed regulation. Photoelectric rotary encoders convert mechanical quantities such as angular displacement and angular velocity of the output shaft into corresponding electrical pulses via photoelectric conversion, outputting them as digital signals (REP). They are available in single-channel output and dual-channel output types. Key technical parameters include pulses per revolution (ranging from tens to thousands) and supply voltage. Single-channel output means the rotary encoder outputs one set of pulses, while dual-channel output rotary encoders output two sets of pulses with a A/B phase difference of 90 degrees. Using these two sets of pulses allows not only speed measurement but also determination of rotation direction. Classified by signal output type: voltage output, open-collector output, push-pull complementary output, and line-driver output.

BEI sensors encoder classification

Encoders can be classified into incremental and absolute types based on their working principle. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses representing the magnitude of displacement. Each position of an absolute encoder corresponds to a specific digital code; therefore, its reading depends only on the start and end positions of the measurement, not on the intermediate process. Rotary incremental encoders output pulses during rotation, and their position is determined by counting equipment. When the encoder is stationary or power is lost, the position is retained in the internal memory of the counting device. Consequently, after a power loss, the encoder must not move. During operation after power restoration, pulse loss due to interference must be avoided; otherwise, the zero point stored in the counting device's memory will shift. The magnitude of this shift is unknown and can only be detected when erroneous production results occur. The solution is to add a reference point. Each time the encoder passes the reference point, the reference position corrects the memory position of the counting device. Position accuracy cannot be guaranteed before reaching the reference point. Therefore, in industrial control, methods such as finding the reference point before each operation or homing upon startup are used. For example, the positioning of printers and scanners uses the principle of incremental encoders; each time they are powered on, a clicking sound is heard as they search for the reference zero point before beginning operation.

BEI sensors encoder working principle

The optical code disk of a series absolute encoder has many light channel tracks. Each track is arranged sequentially with 2 lines, 4 lines, 8 lines, and 16 lines. At each position of the encoder, reading the light/dark state of each track yields a unique 2-ary code (Gray code) ranging from the zeroth power of 2 to the n-1th power of 2. This is called a n-bit absolute encoder. Such an encoder is determined by the mechanical position of the optical code disk and is unaffected by power loss or interference. Absolute encoders determine coding by mechanical position; they require no memory, no reference point search, and no continuous counting. The position is read whenever needed. Thus, the encoder's anti-interference characteristics and data reliability are significantly improved.

BEI sensors encoder hybrid type

Hybrid absolute encoders output two sets of information: one set detects magnetic pole position and provides absolute information functionality; the other set is identical to the output information of an incremental encoder. Photoelectric encoders are angle (angular velocity) detection devices. They convert the angular quantity input to the shaft into corresponding electrical pulses or digital values using the photoelectric conversion principle. They offer advantages such as compact size, high precision, reliable operation, and digital interfaces. They are widely used in devices and equipment requiring angle detection, such as CNC machine tools, rotary tables, servo drives, robots, radar, and military target measurement.

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